Water-tube boiler.



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S. E. FREEMAN.

WATER TUBE BOILER.

(Application filed Apr. 30, M100.)v

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Patented Apr. 29, |902.

S. E. FREEMAN.

WATER TUBE BOILER.

(Applcgtion led Apr. 30, 1900.)

(No Model.)

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4 Sheets-Sheet 4.

Patented Apr. 29, |902.

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S. E. FREEMAN.

WATER TUBE BOILER. (Application med Apr. ab, 1900.) (No Model.) v

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UNITED STATES PATENT OFFICE."

STUART E. FREEMAN, OF ST. LOUIS, MISSOURI.

WATER-TUBE BOILER.

SPECIFICATION formng part of Letters Patent No. 698,697, dated April 29, 1902.

Application'iea Alim so, 1900.

To all whom, it' muy concern:

Be it known that I, STUART E. FREEMAN,`a citizen of the United States, residing at the ctyof St. Louis, in the State ofMissouri, have invented certain new and useful Improvements in Vater-Tube Boilers, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

My invention relates to that class of steamboilers wherein are utilized series of field and circulating water-tubes; and the obg ect of the invention is to produce a boiler of small size wherein the `greatest degree of steam-producing capacity may be obtained commensurate with the dimensions of the boiler.

Afurther object of the invention is to produce a water-tube boiler of simplest form of construction and composed of a minimum of parts that may be readily assembled and disassembled in making repairs or cleaning it.

My invention consists in features of novelty hereinafter fully described, and pointed out in the claims.

Figure I is a view, partly in side elevation and partlyin vertical section, of my improved boiler. Fig. Il is a top or plan view. Fig. III is an end view, partly in vertical section. Fig. IV is au enlarged detail longitudinal sectional view taken on the line IV IV, Fig. III, the central parts of the Water-tubes being broken out. Fig. V is a detail end view of one of the circulating-tubes. Fig. VI is a view in horizontal section taken on the line VI VI, Fig. I, through the boiler-heads and showing the boiler-tubes in top or plan view.

The heads of the boiler are composed of outer chambered sections l and inner chambered sections 2, the sections 1 beingprovided with inwardly-extending apertu red ribs S and the sections 2 with tapped ribs 4, that are located in line with the ribs projecting from the sections l. The sections 1 and 2 are joined at the edges by connecting stud-bolts 5, provided with tightening-butts 6. Located between the head-sections are partition-plates 7, provided with apertures S (see Fig. I) at their upper ends. These partition-plates are clamped between the head-sections and the head-sections tightly assembled by bindingbolts 9, that pass through the ribs 3 and have Serial No. 14,921. (No model.)

The binding studmedium of the ribs 3 and 4 the head-sections are stiffened at the locations of the bindingbolts and the entire heads so constructed that the liability of their bursting is extremely remote.

Between the wall of the sections 1 and the partition-plate 7 are compartments Il, and between the wall of sections 2 and the partitionplate are compartments l2, (see Figs. I, IV, and VI,) the compartments 1l and I2 in each headhaving communication with each other through the apertures S in the partitionplates.

The entire boiler is iuclosed Within a suitable casing (not shown). in order that the heat applied from beneath it may ascend around and among the parts of the boiler to heat the water passed therethrough and convert it into steam.

13 designates a water-supply pipe that leads into the compartment 1l in each head and is provided with open discharge ends 14. (See Figs. I and III.) All of the water fed into the boiler therefore necessarily first enters the compartments l1, from which it passes to the Water-tubes.

15 designates field-tubes having open ends 16, seated in the walls of the head-sections 2 and having communication with the compartments'12, as seen most clearly in Figs. I and IV, and closed seamless ends 17, that are supported by hooks 18 independently of each other at their free ends. (See Figs. I and IV.)

19 designates circulating-tubesthat are at their outer ends seated in the partition-plates 7and having communication with the compartments 1l. These circulating-tubes 19 eX- tend into the field-tubes 15 toA positions near their closed ends, the inner ends of said circulating-tubes being centrally` supported within the field-tubes by tongues 20, (see Figs. I, IV, V, and VI,) that are out out of the tubebody and sprung outwardly therefrom. These IOO tongues securely support the circulatingtubes centrally within the field-tubes, While at the same time they interfere very little with the free passage o t Water past them. The field-tubes 15 being formed with seamless inner ends 17, they otter no opportunity for leakage by the breaking of a seam and consequent damage and annoyance, and said inner ends being independently supported by the hooks 18 they are held separated from each other to permit free passage of heat among them, while at the same time opportunity is oered for expansion and contraction of the tubes in the process ot' their being heated and in cooling.

In the practical use of the boiler the water enters the. compartments 1l in each head thereof and iiows into the circulating-tubes 19, from which it discharges into the inner ends of the field-tubes 15, in which the heating thereof is accomplished by heat rising among the Water-tubes from a suitableheater. The heated water or saturated steam passes from the field-tubes l5 into the compartments 12 in the boiler-heads, and the steam rises in said compartments 12 to the upper ends thereof,from which it passes into the open ends 2l of the steam-pipe 22 and from the steam-pipe 22 into the coil 223, located above the water-tubes of the boiler. The coil 23 receives the heat arising through theboiler, and the saturated steam conveyed into said coil is superheated therein to dry it and render it serviceable, af-

ter which it passes throughthe outlet part. 24 of the coil that extends beneath the main body of the coil into close proximity with the Watertubes, so that the portion of the superheated coil through which the steam last passes receives the greatest intensity of the heat, causing the steam to be converted completely from the saturated condition to a dry or superheated one.

25 designateswater-equalizing pipes eX- tending from the lower ends of the boilerheads and having communication with the Water-receiving compartments 11, as seen in Fig. III.

By my construction of boiler, wherein two heads are utilized, to both of which Water is conducted from a pipe common to both and from which the steam is Withdrawn in a pipe common to both, I am enabled to economize greatly in the dimensions of the boiler. The Water-tubes being connected to each head independently of the other head, the steam produced in one set of tubes passes to its individual head, While the steam produced in the other set passes to its individual head. The water-tubes may therefore be much smaller and be much more quickly heated. Furthermore, the tubes are arranged in alternating tiers from each head, extending across the space between the two heads, the tiers being closely assembled together into much closer relation than would be possible if all of the tubes were connected to a single head,in Which latter instance the tiers of tubes would have to be spaced farther apart in order to leave sufficient substance of the inner head-sections between the tubes to hold them.

I claim as my invention- A 1. In water-tube boiler, the combination of a pair of heads, water-supply and steam pipes each having connection to both of said heads, field-tubes and circulating-tubes connected in independent sets to said heads, and a superheater-coil connected to said steampipe and arranged above said circulating and field tubes, substantially as described.

2. In ahead for Water-tube boilers, the combin-ation of two sections provided with interior ribs,a partition-plate located between said sections, and stud-bolts inserted into said ribs by which the sections are bound together, substantially as described.

STUART E. FREEMAN.

In presence of E. S. KNrGHT, N. V. ALEXANDER. 

